Ship s log



2 Sheets-Sheet 1.

(No Model.)

G. THOM. saws LOG.

Patented Oct. 16, 1894.

FIG. w/

FIG. VI

W/T/VESSES a) 4 l ATTORNEYS in: mums rams m. PHOTD-LITHO 2 t e e h S t ee h S 2 M 0 0L H s TP m G M d 0 M 0 m Patented Oct. 16,1894.

WITNESSES fgarye JZOWZ.

'k-mww Arman Us UNITE STATES PATENT OFFICE.

GEORGE THOM, OF DUNEDIN, NEW ZEALAND.

SHIPS LOG.

SPECIFICATION forming part of Letters Patent No. 527,464, dated October16, 1 894.

Application filed March 22,1894- Srial No. 504,713- (No model.)

To all whom it 'may concern:

Be it known that I, GEORGE THOM, a subject of the Queen of GreatBritain, of McOrae Street, Mornington, Dunedin, in the Colony of NewZealand, have invented new and useful Improvementsin Apparatusforlndicating the Distance Traveled by Steam and Sailing Ships, of whichthe following is afull, clear, and exact description.

My invention relates to apparatus attached to a vessel whose progress itis desired to indicate and has for its objects providing apparatus whichshall overcome the difficulties at present experienced with the logshitherto .cross section of the same.

in use for this purpose.

With my invention indicators may be fixed on the bridge and uuderthe eyeof the officer stationed there, in the engine room in view of theengineer, or in other desired parts of a vessel. I I

It is well known that when a sailing or other vessel is going veryslowly the logs in use hitherto will sink in the water and thus fail togive a record of the progress of the vessel. My apparatus is designed toovercome this objection and to indicate the distance traveled even whenthe ship is going at a very slow speed.

A further improvement is a tube and fittings which form abearing for ashaft passing through the bottom of the ship and at the same timeexclude the water and prevent the same gaining an entrance to thevessel.

I attain these objects of my invention by mechanism illustrated on theaccompanying drawings, whereon similar letters refer to similar partsthroughout the several views.

Figure I, is a side elevation of a steam ship I with my apparatusattached. Fig. II, is a Fig. III, is a vertical elevation of theapparatus and indicator for use in the engine room, part in section.Fig. IV, is a side elevation of the same, in section on line A, B. Fig.V, is a plan of the same, with the indicator removed. Fig. V1, is a planof my arrangement of indicator to be used in the engine room, with topof casing removed. Fig. VII, is a front elevation of indicator for useon the bridge of ship. Fig. VIII, is a side view of the same, in sectionon line C, D. Fig. IX, is an enlarged view of a detail. Fig. X, is anenlarged view of a regulator. Fig. XI, is aplan of the same.

(a) in Figs. I and II represents the rotatorand (a) the shield forprotecting the same from the action of waves and of the water when theship is rolling, and which may be placed on either side of the vesseland in the most convenient positions. By Fig. II it will be seen thatthey are so situated as to be well above the lower portion of the hulland thus would be clear of mud in shallow water.

(19 and b) are respectively the indicators for the bridge and engineroom.

In Figs. III, IV and V the rotator (a) is shown on a larger scale,secured to its shaft (o by screws ((1 The bearings (a*), secured in thebrackets (a by the pins (a receive this said shaft and take the thrustof the same upon the plates (a Upon the shaft (a is formed a worm (awhich, gearing with the worm wheel (a), transmits its motion to theshaft (0). At its upper end this shaft (0') is connected by theregulator (g) to the small shaft (9 whereon is formed a worm (b whichgears with the first (h of a train of wheels in the indicator (1)). 1The rotator (a) with its bearings (a and brackets ((1 are carried by theshield (a') which is fixed to the hull (lo) of the vessel. The shaft(0') is supported upon the bearing (0 by its collar (0 Fig. IV.

(0 is a stuffing box and (0 a gland surrounding the shaft (c'). Thespace (0 is filled with oil to lubricate the bearing (0 and to excludeany water which might otherwise find its way between thebearing (c andshaft (0') into the ship. The oil is prevented from escaping in anupward direction by the studing box (0 and being lighter than water doesnot escape downwardly. The tubes (d and d) are fixed to the hull by thebolts (C1 and hold the bearingtc in position by the bolts ((1 ((1 is acover to shield the worm wheel (0) from the action of the water and theshield (d performs a similar duty to the worm (a The rotator (a) is madeof phosphor bronze by preference and with four blades, shaped as shownby curve (h) Fig. IV, to give a clear run for the water, and having apitch of about two feet makes two thousand six hundred 5 iS providedwith a pointer (b and "dial whereby the distance traveled may be read.

and forty revolutions per mile, and the worm wheel (0) having thirtyteeth makes the shaft (0) and worm (b revolve eighty-eight times permile. The wheel (19 has eighty-eight teeth and gearing with the worm (19makes one revolution per mile. The pinion (N) on the same arbor as thewheel (19 has ten leaves which gear into the one hundred teeth on wheel(b The pinion (b has ten leaves gearing with the one hundred teeth onwheel (b and so on throughout the remainder of the series. It will beobvious that the indicator will thus show single miles and multiples often of the same according to the number of wheels in the train. Each ofthe wheels at a glance. I

The rotator may be of such diameter and pitch as may be required toovercome the friction of the different parts and accurately drive theindicator (1)), and I find a pitch of. about two feet as stated, andQdiameter of about ten inches suitable for most large vessels.

In Figs. VI and IX is shown a provision for throwing the indicator inand out of gear with the worm (b and for setting the pointers (b Thearbors are grooved as shown at (e) in Fig. IX and the arbor of the firstwheel (6 has a second groove (6). The pins (6 pass through the bosses (6and engage with these grooves (e) to prevent lateral movement of thesaid arbors. By withdrawing the pin (e and pulling the knob (6*) thepinion (19 may be disengaged from the wheel (b and wheel (19 from Worm(b and by replacing the pin (e to engage with the groove (6') no motionof the indicator will take place. In a similar manner th'e other wheelsmay be thrown out of gear to set the pointers. Immediately the Vessel isunder way the officer puts the indicator into Work.

(9) is the regulator by which the indicator may be adjusted to makeallowance for slip tween the friction wheels (g' and g is maintained bythe helical spring (g which bears against the brass bearing (9 The setscrew (9 and washer (9 hold this spring (9 in gear and the apparatusbegins to position. Should the indicator not be working accurately thewheels (9" and 9 may be separated by means of the spring (9 to throwthem out of gear and the wheel (9 may then be raised or lowered asdesired until the necessary speed is communicated to it by the varyingdiameter of the conical wheel (9').

Figs. VII and VIII show the form of indicator for the bridge; which is amodification 7.0 of the one previously mentioned and does not requirefurther description. Six dials and a train of six wheels are shown onthis indicator giving a capacity for indicating up to one hundredthousand miles without resetting.

Where it is difficult to fix a straight shaft as (c') I use some kind offlexible shafting, or I may use light shafting and bevel gearing toconnect the indicator and rotator. In this manner I am enabled to choosethe most favorable position for the rotator and where there will be nofear of its being damaged.

I am aware that indicators and rotators have already been employed forindicating the speed of vessels and I do not claim these broadly, but

What I do claim as my invention, and wish to secure by Letters Patent,is-

1. In an apparatus such as set forth herein 0 for indicating thedistance traveled by steam and sailing vessels, the combination of theshaft (0') having collar (0 with bearing (0 stuffing box (0 and tubes (dand at) providing a space (0 for containing oil, substantially 5 as andfor the purposes described and illustrated. y

2. In combination, with the rotator, .the shaft 0 extending therefrom,the indicator mechanism, the said shaft 0' having a cone 'roo frictiongear 9' at its upper end which upper end is guided to move laterally inthe indicator case, the shaft 9 extending from the. indicator mechanismparallel with the shaft 0, the driving disk g adjustable along the shaftand the means for holding the upper end of the shaft 0' inwardly topress the friction wheel 9' against the driving disk, substantially asdescribed.

3. The combination, in an apparatus such as '1 10 described herein forindicating the distance traveled by steam and sailing vessels, of arotator (a) having worm (a with worm wheel (a) shaft (0) bearing (0stuffing box (0) tubes (d and 61) space (0 regulator (g) and indi- [I5cator (19'), substantially as and for the purposes set forth herein andillustrated.

GEORGE THOM.

'Witnesses:

GEO. S ITH, v ERNEST SMITH BALDWIN.

